Sprinkler controls are typically bunched in one spot at the source of the water. This is called the "manifold." If you don't need the backyard controller out back (probably not) then cluster them in one spot and run the supply line (assuming only one zone) out back.
However, if you have more than one zone in the back, you will need to run a separate supply line to a cluster of controllers in the back. Of course, you will also have to run the full length of controller wire from the back manifold to the control timer so they can be actuated properly.
BTW, the bottom pic shows the power being provided through an external conduit to a receptacle box. I DO NOT like this setup. I would have taken power from inside the house, eliminating the conduit mess. Just sayin'
Last edited by CallMeVilla; 06-08-2013 at 08:15 AM.